Furnace.



1). J. MQKENZIE.

FURNACE.

APPLICATION FILED 00120, 1908. RENEWED JAN. 2, 1912A Patented Mar. 5, 1912.

3 SHEETS-SHEET 1.

I l n I ,joz gal v W I D. I. MoKBNZIE.

FURNACE.

APPLICATION FILED OUT. 20, 1908. RENEWED JAN. 2, 1912.

Patented Mar. 5, 1912.

3 SHEETSr-SHEET 2.

2 5%. Eli! 'D. J. MCKENZIE.

FURNACE.

APPLICATION TILED 001. 20, 1908. RENEWED JAN. 2, 1912.

Patented Mar. 5, 1912.

3 SHEETS-SBEEET 3.

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DOUGAL J. MCKENZIE, OF CHICAGO, ILLINOIS;

FURNACE.

Specification of. Letterslatent.

PatenteflMar. 5,1912.

Application filed October 20, 1908, Serial No. 458,636. Renewed January 2, 1912. Serial No. 689,129.

To all whom it may concern: 7

Be it known that 'I, DOUGAL/J. MoKnNzrE, a citizen of the United States, res1ding at Chicago, in the. county of Cook and State of Illinois, have invented certain new anduseful Improvements in Furnaces, of which the following is a specification.

The object of my invention is to provide a new 1 and improved furnace for heating steam boilers or for other purposes.

More particularly my invention is an improved Dutch oven furnace having an improved fuel feeding mechanism;

My invention also relates to details of a fuel magazine for such a furnace, to the ar-, rangement of the grate bars and the mechanism for operating them, to the ash-pit, to the air supply openings of the furnace, and various other details and features.

The objects of my invention will be made further apparent in the following specification and claims taken in connection with the accompanying drawings.

My invention may be embodied in a wide variety of forms, but I have shown in the drawings one particular design which is one 7 of those at present preferred by me, but I claim the invention in, its broad aspect as well as in the specific form disclosed.

Referring to. the drawingsFigure .1 is a front end elevation of the furnace. Fig. 2 is a side elevation. Fig. 3 is a transverse section on the line 3-3 of Fig. 4, and Fig. 4

is a longitudinal vertical section on the, line 44 of Fig. 3. I

In the drawings I have shown my improved furnace in conjunction with a steam boiler of the type having a horizontalcylin;

drical outer shell 15, a large inner cylindrical flue 16-17 and an end flue sheet 18 with a flange 19 attached to the outer shell 15by means of rivets 20. In Fig. 4 the lower art of the flue 16-17 is seen in section as indicated by the reference numeral 16, and the upper part of this same flue has its section indicated by the reference numeral 17. At its front end the flue 16-17 is lined on the inside with fire-brick 21. A brick wall 22 is built up at each side of the front end of the'boiler and extends across beneath the frontend of the boiler, as indicated by the reference character 22; This wall also extends forward on each side of the furnace, as indicated by the reference numeral 22. Metal beams 23 extend horizontally on each side of the furnace being supported at their rear ends by the wall 22 and at their front ends by the furnace front'wall, which will be described presently. These metal beams 23 have inside ledges 25 which support the top, aroh 24. At the rear end of the furnace and the front end of the boiler, the brick work 26 is filled in between the top of the arch 24 and the upper part of the cylindrical fire-brick lining 21. The cast metal furnace front is indicated by the reference numeral 28. On each side standing above the side walls 22 are the cast metal side plates 29 above which are superposed side plates 30. Each side wall 22 is surrounded by a cast metal cap plate 31 having an inclined inside edge portion 32. The side plates 29 have air inlet openings 33 at intervals. At

their lower sides or edges in a vertical plane and through these edges air inlet openings '40 are made at frequent regular intervals.

The frame 393538 just described rests its weight upon the cap plates 31 and supports the shafts 41.0n which the grate bars 42 are mounted. Each shaft'41 carries a short crank 43 and all the cranks on one side of the furnace have their extremities connected together by a link 44. The shaft 45 is journaled below the grate bars 42 in the cap plate 31 and carries a short rojecting crank arm 46, which has a pin and slot connection 50 with the link 44. This shaft 45 projects through the front wall 28 of the furnace and carries a hand lever 47 on the front end. A notched quadrant 48 and a co-acting dog 49 onthe lever 47 facilitate loc the grate bars in normal position, ocking them when it is ,desired by means of the lever'47 to shake the ate bars 42 as will be more fully explained ater.

Between the outside wall 29-30 and the supporting beam 23 is a space which is utilizedto form a fuel magazine. The leaf 51 spans across this space, one edge ,being pivoted at 52 adjacent to the side wall 2930 and the other e ge being bent in the arc of a circle and being adapted to swing about the axis 52 in opposition to the lower edge of the supporting beam 23. The link 54 connects this leaf or closure 51 to the extremity of the crank arm 55, which projects from the shaft 56, this shaft 56 extending throu h the furnace front 28 and carryin a han lever 57 at its end. A notched qua rant 58 and a co-acting pawl on the lever 57 permit adjustment of said lever and a consequent adjust'ment of the opening 60 between the ower' edge of the supporting beam 23 and the edge ofthe leaf 51. Above the supporting beam 23 and carried thereby is an inclined plate 61, which acts tain and guide fuel.

The ash-pit 62 has an inclined floor 63 at as a wall to rethe front, thus providing ready access for removing ashes. The transverse grate bars 64 are carried on the single central lon itudinal shaft 65, which projects through t e furnace front 28 carrying a hand lever 66 on its extremity. The door 67 is provided to give access to the furnace above the grates 1n case it is desired to feed the furnace by shoveling in fuel in the ordinary manner, or in case access to this part of the furnace is desired for any other reason. An ash-pit door 68 is provided in the furnace front and adjustable air inlets 69' are also'provided. as

shown. At the rear end' of thefurnace and the front end of the boiler the smoke-box is closed by the pendant hinged doors 71, the

hinges being designated as 72. From this.

smoke-box the chimney 73 leads away as shown. I

The magazine walls 30 and 61 are prefer- I v ably joined together at their front and rear ends so as to form removable boxes at the sides of the beams 23. Each box 30, 61 can be lifted up and set aside when this is needful'for cleaning the boiler or for any other purpose. v

1 In ordinary operation the fuel magazines between the .walls 30 with a quantity of coal. or other suitable fuel. The lever 57 is fixed so as to give the outlet opening 60 from each fuel magazine the desired adjustment. The fuel spreads down evenly on the grate bars 42 and on the bars 64. The air for combustion purposes feeds in through the side openings 33 and 40,

the grate bars 42, and also,through through skilled in the art'and and 23*61 are filled passes through the grate bars and thefuel thereon and the gases from the fuel passback under the ,top arch 24 directly into the" enings 68 and 69 and up main flue 16-17 with its lire-bricklining 21. After passin through, this flue into a combustion cham r at t e rear. end "of the boiler theyreturn through a plurality of small fiues above andaround the main flue 16-17 and discharge into the smoke-box covered by the doors 71. It is obvious that by shaking the lever 47 the crank arm 46 is oscillated, thus by reason of the pin and slot connection 50 causing the link-44 and the grate bars 42 to oscillate. This will obviously cause the fuel to descend over the grate bars 42, the fine ashes meanwhile shaking through. Clinkers and ashes upon the grate bars 64 may be dumped into the ashpit 62 by throwing over the lever 66. J It is obvious that a supply of fuel having become accumulated in the, two fuel magazines at the sides'of the top arch 24, the labor necessarv for feeding this fuel to the furnace, and for keeping the grate clear of the ashes and clinkers, will be very small so that a single fireman can readily attend to a large number of these furnaces. This saving of the labor of attendance is one of the many advantages of my invention. Another advantage lies the fact that the furnace is smoke consuming. At no time are large bodies of fuel thrown upon the fire and thus the heat of the fire is always intense enough to insure complete combustion, thus preventing smoke. Still another advantage lies in the perfect distribution of the an fed under the grates with the fuel thereon. I also desire to call attention to the ease with which clinkers may be removed and to the fact that there may be aconsiderable accumulation of clinkers on the grate bars 64 without obstructing the fuel on the sloping grate bars 42. These advantages and many others will be readily ap reciated by those amiliar with the actual working of the apparatus as claimed. Having described one specific form of my invention, and having pointed out the rincipal objects thereof and principal a vantages realized, I claim:

- 1. A furnace having masonry side walls bounding the ash pit, ates slopin downwardly and inwardly i r bm said si ewalls, fuel magazines adjacent to the upper edges of said grates, hinged closures for the bottom of said fuel magazines, shafts lying above the masonry side walls, operating levers connected to said shafts, and crank and link connections from the shafts to the respective closures. 3

2. A furnace having masonry side walls bounding the ash pit, grates sloping downvvardly and inwardly from said side walls,

fuel magazines adjacent to the upper edges of said grates, hinged closures for the botedges of the grates, shafts lying above the masonry side Walls, operating levers connected to said shafts, and crank and link connections from the shafts to the respective closures. y In testimony my name. DOUGAL J. MCKENZIE.

Witnesses: EDYTHE M. ANDERSON,

ANNIE C. OOURTENAY.

whereof, I have subscribed is I 

